資訊專欄INFORMATION COLUMN
PySh
Why another shellAnother shell can run anywhere Python exists.
Supported shell featureBecause it"s fun.
Common shell features can be found here. Pysh already have:
|, Pipe output
$var, Use value for variable
" ", double quote (allows variable and command expansion)
Usagegit clone https://github.com/jiacai2050/pysh.git
cd pysh
python -m pysh.shell
## Demo
> ls
.git
.gitignore
.pre-commit-config.yaml
assets
pysh
README.md
> echo $HOME
/Users/liujiacai
> echo ${JAVA_HOME}
/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
> pwd
/Users/liujiacai/codes/python/pysh
> cd ..
/Users/liujiacai/codes/python
> pwd
/Users/liujiacai/codes/python
> cat /etc/hosts | grep 127.0.0.1
127.0.0.1 localhost
> grep 127.0.0.1 /etc/hosts
127.0.0.1 localhost
Supported commands can be found here.
More commands are on the way. PR welcomed !
Have fun ?
How PySh workA shell in unix box is a bridge bewteen user and the kernel through system call.
As we can see from above picture (taken from here), some commands (eg ls, cat) are passed to other programs, while built-in commands (eg cd, exit) are executed inside shell. This way can keep shell small in size and strong in function.
In order to let PySh run anywhere (hi, Windows, I mean you), PySh implmented all commands in its core, so there is no differences bewteen builtins and one that is not, also you can say all commands are builtins.
One thing I should mention here is:
Pipelines between different commands are supported by generator in Python.
So, every command should yield something, this is like s-expression in Lisp world, where every s-expression should return a value.
How to contributePySh use pre-commit to ensure code quality, so you should install it before contribute.
Fork and PR ?
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